After Monday night’s show, in which the “Rhoda” TV star and her partner Tristan MacManus bizarrely did a cha cha channeling Grace Kelly and Freddie Mercury, she told xfinityTV, “I’m thrilled to be here! I’m thrilled to be alive.

“The cancer seems to be receding and it’s an incurable cancer, but it’s not growing or proliferating at this moment and the pills I’m on — which I’m going to take in a few minutes — are doing the trick.

“It’s known that they stop working after maybe a year, ten months. But I bought time!”

Harper confided backstage, “I was supposed to be dead in three months in January. So I’m way past my expiration date. Everything’s gravy. And we should all live like that — in the day, in the moment.”

Harper, who donned a ladylike dress and wore pearls and a blonde wig to look like Kelly, said she was a huge fan of the actress-turned-royal.

“She did not let Hollywood change her,” Harper explained. “Show me a picture with cleavage. Doesn’t exist! She was always this elegant, beautiful person who went on to be royalty. She was American royalty before Jackie Kennedy. She was quite a powerful presence.”

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Harper moved on to Week 4 as Bill Nye the Science Guy was eliminated from “DWTS” on Monday. Although Harper got just as low a score as Nye, a dismal 16 out of 30, the sitcom star couldn’t care less.

MacManus said he came up with the unusual concept having the Queen frontman and Monaco’s Queen dance together just for fun.

“Sometimes you have a hard week and you can get down about it and you do better and sometimes you can concentrate too much the next week,” he said. “I was afraid it was going to go into that. We just needed a break [where] we can laugh about what we look like and keep it fun and forget about technique.”